| Computer Code: |
UGCL |
Preferred Map Code: |
UC |
| Status Code: |
Full |
| Age range: |
Devensian Stage (QD)
— Devensian Stage (QD) |
| Lithological Description: |
A typically reddish brown, but locally dark grey, black, brown and yellowish brown, laminated clay, silt and fine-grained sand, with localised black organic laminae formed of reworked Jurassic material. |
| Definition of Lower Boundary: |
Generally a sharp, undulating, draped, unconformable contact with the gravelly clayey sand diamictons (tills) of the East Grampian Glacigenic Subgroup, but locally a sharp, undulating, draped, unconformable contact with deposits of glaciofluvial gravel with erect pebbles at the top, probably formed in a periglacial environment. |
| Definition of Upper Boundary: |
Generally a sharp, undulating, draped, erosional and unconformable contact with glaciofluvial or alluvial sand and gravel. Locally the boundary is seen as a sharp, planar, unconformable glacitectonic contact with red clayey diamictons (deformation tills, glaci- tectonites) of the Logie-Buchan Glacigenic Subgroup towards the North Sea coast. |
| Thickness: |
To 20m |
| Geographical Limits: |
Buchan, north-east Scotland, between Peterhead, Ellon and Aberdeen. |
| Parent Unit: |
Logie-Buchan Glacigenic Subgroup (LBD)
|
| Previous Name(s): |
"Red Series" clays or glaciolacustrine deposits [Obsolete Name and Code: Use UGCL]
(-2515)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Partial Type Section |
Stream section 400m northnorthwest of Balluss Bridge, Mintlaw. Merrit et al., 2000, 2003; Ugie Valley. |
| Partial Type Section |
Abandoned claypit at Errolston, Cruden Bay. Merrit et al., 2000, 2003; Ugie Valley. |
| Reference(s): |
| Peacock, J D. 1984. Errolston. 108-109 in Buchan Field Guide. Hall A M (editor). (Cambridge: Quaternary Rresearch Association.) |
| Connell, E R, Hall, A M, Shaw, D and Riley, L A. 1985. Palynology and significance of radiocarbon dated organic materials from Cruden Bay Brick Pit, Grampian Region, Scotland. Quaternary Newsletter, Vol.47, 19-25. |
| Hall, A M and Connell, E R. 1991. The glacial deposits of Buchan, northeast Scotland. 129-136 in Ehlers, J, Gibbard, P L and Rose, J (editors), Glacial Deposits in Great Britain and Ireland. (Rotterdam: Balkema.) |
| Merritt, J W, Connell, E R and Bridgland, D R (editors). 2000. The Quaternary of the Banffshire Coast and Buchan; Field Guide. (London: Quaternary Research Association.) |
| Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland) |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
S077
S076
|
